Abstract
The behaviour of colloidal mono- and bilayers in external magnetic fields and undershear is discussed and recent progress is summarized. Superparamagnetic colloidalparticles form monolayers when they are confined to a air–water interface in ahanging water droplet. An external magnetic field allows us to tune the strength ofthe mutual dipole–dipole interaction between the colloids and the anisotropy ofthe interaction can be controlled by the tilt angle of the magnetic field relativeto the surface normal of the air–water interface. For sufficiently large magneticfield strength crystalline monolayers are found. The role of fluctuations in thesetwo-dimensional crystals is discussed. Furthermore, clustering phenomena in binarymixtures of superparamagnetic particles forming fluid monolayers are predicted.Finally, we address sheared colloidal bilayers and find that the orientation ofconfined colloidal crystals can be tailored by a previously applied shear direction.
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